One of the engineer's in my group asked if I had any information on how a four transistor current source works. I decided that to pull together a quick Mathcad worksheet. The Wikipedia refers to this current source configuration as a four-transistor improved current mirror. Figure 1 shows an image of this circuit from the Wikipedia.
Figure 1: Four-Transistor Improved Current Mirror (Source: Wikipedia).
I have attached a PDF version of the Mathcad worksheet and included a link to Mathcad 15 source in a zip file. There is a macro in it that just generates the table of contents.
Hello sir,
Could you please upload the BJT mirror circuit containing PNP pair at the top and the NPN pair at the bottom and give a explaination for the same.
I will put that circuit on my list to write about.
Mathscinotes
Ok mathscinotes. Thanks !